Add libgl-dev as a dependency for qt6-base-dev.

debian/changelog

@@ -1,5 +1,8 @@
 qt6-base (6.2.4+dfsg-3) UNRELEASED; urgency=medium
 
+  [ Patrick Franz ]
+  * Add libgl-dev as a dependency for qt6-base-dev.
+
  -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sun, 10 Apr 2022 21:08:21 +0200
 
 qt6-base (6.2.4+dfsg-2) experimental; urgency=medium

debian/control

@@ -331,7 +331,8 @@ Package: qt6-base-dev
 Section: libdevel
 Architecture: any
 Multi-Arch: same
-Depends: libglx-dev,
+Depends: libgl-dev,
+         libglx-dev,
          libopengl-dev,
          libqt6concurrent6 (= ${binary:Version}),
          libqt6core6 (= ${binary:Version}),